<template>
  <ul class="app-header-nav">
      <li class="home"><RouterLink to="/">首页</RouterLink></li>
      <li v-for="item in list" :key="item.id" @mousemove="show(item.id)" @mouseleave="hide(item.id)">
          <router-link :to="`/category/${item.id}`" @click="hide(item.id)">{{item.name}}</router-link>
          <div class="layer" :class="{open:item.open}">
              <ul>
                  <li v-for="sub in item.children" :key="sub.id">
                      <router-link :to="`/category/sub/${sub.id}`" @click="hide(item.id)">
                        <img :src="sub.picture" alt="">
                        <p>{{sub.name}}</p>
                      </router-link>
                  </li>
              </ul>
          </div>
      </li>
  </ul>
</template>

<script>
import { computed } from '@vue/runtime-core'
import { useStore } from 'vuex'
export default {
  name: 'AppHeaderNav',
  setup () {
    const store = useStore()
    // 拿到vuex中的分类列表
    const list = computed(() => {
      return store.state.category.list
    })
    // 跳转的时候不会关闭二级类目,关闭二级类目的方法
    const show = (id) => {
      store.commit('category/show', id)
    }
    const hide = (id) => {
      store.commit('category/hide', id)
    }

    return { list, show, hide }
  }
}
</script>

<style lang="less" scoped>
.app-header-nav {
    position: relative;
    width: 820px;
    display: flex;
    justify-content: space-around;
    padding-left: 40px;
    z-index: 999;
    > li {
      margin-right: 40px;
      width: 38px;
      text-align: center;
        > a {
            font-size: 16px;
            line-height: 32px;
            height: 32px;
            display: inline-block;
      }
      &:hover {
        > a {
          color: @xtxColor;
          border-bottom: 1px solid @xtxColor;
        }
      }

    }
}
// 二级类目弹层样式
.layer {
  &.open{
    height: 132px;
    opacity: 1;
  }
  width: 1240px;
  background-color: #fff;
  position: absolute;
  left: -200px;
  top: 56px;
  height: 0;
  overflow: hidden;
  opacity: 0;
  box-shadow: 0 0 5px #ccc;
  transition: all .2s .1s;
  ul {
    display: flex;
    flex-wrap: wrap;
    padding: 0 70px;
    align-items: center;
    height: 132px;
    li {
      width: 110px;
      text-align: center;
      img {
        width: 60px;
        height: 60px;
      }
      p {
        padding-top: 10px;
      }
      &:hover {
        p {
          color: @xtxColor;
        }
      }
    }
  }
}
</style>
